# Intro to Object Orientation - Ruby ## Intro to Object Orientation - Ruby - Review Lecture ### Objectives: * Define a new class using the `class` keyword. * Instantiate instances of the class with the class constructor `new`. * Add instance methods to your class with `def` in the body of the class. * Set instance variables through writer instance methods. * Identify the scope of an instance variable. * Read an instance variable through a reader instance method. * Use `attr_accessor` to define reader and writer methods for attributes. * Hook into an object's instantiation with `#initialize`. ### Video \ [Direct link to MP4.](http://learn-co-videos.s3.amazonaws.com/ruby/Intro.to.OO.ruby.LV.mp4) *This video is meant to be a review of the first few topics in Object Orientation in Ruby.* View [Intro to Object Orientation - Ruby - Review Lecture](https://learn.co/lessons/intro-to-object-orientation-ruby) on Learn.co and start learning to code for free.